Photocopying – Contact printing – Light boxes
Patent
1984-07-06
1986-01-21
Wintercorn, Richard A.
Photocopying
Contact printing
Light boxes
G03B 2704
Patent
active
045659850
ABSTRACT:
Film copying apparatus especially for copying a negative film such as an X-ray film upon an underlying sensitized film by exposure to light rays for a predetermined timed interval. The apparatus comprises a four-sided frusto-pyramidal housing structure in which an outer housing formed from a folded sheet of plastic material and an inner housing of a light reflecting metal are secured in nested relation and coact to provide a light chamber having a bottom light transmitting opening that is spanned by a transparent light transmitting window. A flat base member coextensive with the window is provided with an upper surface of a soft compressible material and is connected at one edge to one side of the outer plastic housing by hinges which permit the housing structure to be tilted to an open position to enable placement of the light sensitized film and superposed film negative on the compressible material of the base member, and to a closed position with the light transmitting window overlying and pressing against the film negative. The hinges have a floating connection with the housing structure, whereby the weight of the housing structure will be uniformly applied and operate to hold the film negative and the sensitized film in engagement during exposure.
REFERENCES:
patent: 1159955 (1915-11-01), Kittredge
patent: 2356385 (1944-08-01), Cooley
patent: 2366722 (1945-01-01), Gaebel
patent: 2692540 (1954-10-01), Bing et al.
patent: 3221631 (1965-12-01), Bernstein
patent: 3630614 (1971-12-01), Kazle
patent: 3761176 (1973-09-01), Lewer
patent: 3888586 (1975-06-01), Arden et al.
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